diff --git a/pkgs/development/libraries/incrtcl/default.nix b/pkgs/development/libraries/incrtcl/default.nix
index e7f575b04be7..a8a714067f4b 100644
--- a/pkgs/development/libraries/incrtcl/default.nix
+++ b/pkgs/development/libraries/incrtcl/default.nix
@@ -1,31 +1,39 @@
-{stdenv, fetchurl, tcl}:
+{ stdenv, fetchurl, tcl }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "incrtcl";
   version = "4.2.0";
 
   src = fetchurl {
-    url = mirror://sourceforge/incrtcl/%5BIncr%20Tcl_Tk%5D-source/3.4/itcl4.2.0.tar.gz;
+    url    = "mirror://sourceforge/incrtcl/%5BIncr%20Tcl_Tk%5D-source/3.4/itcl${version}.tar.gz";
     sha256 = "0w28v0zaraxcq1s9pa6cihqqwqvvwfgz275lks7w4gl7hxjxmasw";
   };
 
   buildInputs = [ tcl ];
   configureFlags = [ "--with-tcl=${tcl}/lib" ];
+  enableParallelBuilding = true;
+
   patchPhase = ''
-      substituteInPlace configure --replace "\''${TCL_SRC_DIR}/generic" "${tcl}/include"
-  '';
-  preConfigure = ''
-      configureFlags="--exec_prefix=$prefix $configureFlags"
+    substituteInPlace configure --replace "\''${TCL_SRC_DIR}/generic" "${tcl}/include"
   '';
 
-  passthru = {
-    libPrefix = "itcl3.4";
-  };
+  preConfigure = ''
+    configureFlags="--exec_prefix=$prefix $configureFlags"
+  '';
+
+  postInstall = ''
+    rmdir $out/bin
+    mv $out/lib/itcl${version}/* $out/lib
+    rmdir $out/lib/itcl${version}
+  '';
+
+  outputs = [ "out" "dev" "man" ];
 
   meta = with stdenv.lib; {
-    homepage = http://incrtcl.sourceforge.net/;
+    homepage    = "http://incrtcl.sourceforge.net/";
     description = "Object Oriented Enhancements for Tcl/Tk";
-    platforms = platforms.unix;
-    license = licenses.tcltk;
+    license     = licenses.tcltk;
+    platforms   = platforms.unix;
+    maintainers = with maintainers; [ thoughtpolice ];
   };
 }